"Yet" as adverb in different tenses and format

[khauff85]

What is the difference in meaning between the sentences mentioned below?
Are the word yet allocated correctly in each sentence?
When to use "yet" in Present Simple, Past Simple and Present Perfect?. Can also be used in all other tenses such as Future (all forms), Progressive (all forms)?

He hasn't registered for class yet.
He isn't registered for class yet.
He isn't yet registered for class.
He doesn't yet register for class.
There isn't registration for class yet.
There is no registration for class yet.
He hasn't yet registered for class.
He has yet to register for class.
He had yet to register for class.

 

[tedmc]

What is the difference in meaning between the sentences [STRIKE]mentioned[/STRIKE] below?
[STRIKE]Are[/STRIKE] Is the word "yet" [STRIKE]allocated [/STRIKE]correctly used in each sentence?
When [STRIKE]to[/STRIKE] do we use "yet" in the present simple, past simple and present perfect tenses?. Can it also be used in all other tenses such as the future (all forms) and the Progressive (all forms)?

He hasn't registered for class yet.
He isn't registered for class yet.
He isn't yet registered for class.
He doesn't yet register for class. wrong
There isn't registration for class yet.
There is no registration for class yet.
He hasn't yet registered for class.
He has yet to register for class.
He had yet to register for class.

"Yet" can be used with any tense.

You should have numbered the sentences for easy reference.